While Romney said "this year," the most recent data available is from 2011, so that's what we'll use. In 2010, EIA data show, 726 million barrels of oil came from federal lands, including offshore wells. In 2011, it was 626. That’s a drop of 13.77 percent, which can be rounded to 14 percent.

This data, as well as a more complex measure (it involves royalties and British thermal units of energy, but we’ll spare you), would appear to render the statement accurate.

How reliable is it?

But is the 14 percent figure cherry picked?

Yes, says Jay Hakes, who directed the independent U.S. Energy Information Administration for seven years during the Clinton administration. "From a statistical standpoint, to take one year out of three — one year is not indicative of a trend," he said.

So we pulled the numbers from when George W. Bush was in office -- January 2001 to January 2009 -- as well as from when Obama was in office. In our chart, we’ve italicized the years he was in office and put in bold the years Obama led.

We note that:

• From 2004-08, well into Bush’s tenure, oil production on federal lands and waters fell in four of five years, for a net decrease of 16.8 percent.

• From 2009-11, the Obama years, oil production rose two of three years, for a net increase of 10.6 percent.

Fiscal year

Offshore (million barrels)

Onshore

Total

Percent change from prior year

2003

579

101

680

n/a

2004

572

97

669

-1.6%

2005

542

96

638

-4.6%

2006

471

101

572

-10.3%

2007

514

105

619

+8.2

2008

462

104

566

-8.6%

2009

527

105

632

+11.7%

2010

618

108

726

+14.9%

2011

514

112

626

- 13.8%

Source: EIA; some numbers slightly off due to independent rounding in source data

It’s also worth taking a closer look at what went into the overall number.

From 2009 to 2010, oil production from offshore sources rose by 14.9 percent. Prior to that, before Obama’s presidency, the offshore volume fell for several years, and it was erratic even during a phase in which it rose, EIA figures show.

Yet onshore oil production generally rose on federally owned land -- and did again in 2011, by 3.7 percent. Offshore production that took the hit, falling 16.8 percent.

So the big story of the one-year dropoff in public production is the Deepwater Horizon oil spill of 2010. A six-month moratorium on exploratory drilling followed — though it by no means stopped gulf oil production— along with changes in regulation that forced the industry to adjust.

While the moratorium could have been more targeted, it wasn’t a policy choice unique to Obama, said Hakes, the former EIA director who also directed policy and research for the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling. Bush had his own disasters to contend with: Hurricanes Katrina and Rita in 2005 also drove a decline the next year, said Shirley Neff, a senior adviser at EIA. And President Richard Nixon ordered a moratorium in the wake of a 1969 well blowout off the coast of Santa Barbara, Calif.

"Every president, if you have a blowout like that … is going to get a moratorium," Hakes said.

Who gets the credit or blame?

It’s important to note that most big boosts in production, according to experts, follow years of earlier exploration and drilling -- efforts begun under the policies of prior administrations. By the same token, Obama’s actions in office should have an impact in the years to come.

"I don't think Obama can claim a lot of credit for production levels now, and I'm not even sure that Bush can," said Hakes, the author of A Declaration of Energy Independence, which looks at energy policy from President Harry S. Truman to President George W. Bush. "If you're going to go back — who should get the credit — I might be able to find something that Nixon did."

The recent expansion of hydrofracking — using pressurized fluid to get gas or oil out of rock formations — came about over decades.

"That's why attaching production things to any particular administration is a very, very tricky business, and probably best handled in books rather than in articles," Hakes said. "There are just too many factors."

So, Obama certainly shouldn’t be claiming full credit for increases in oil production on private land — but neither should supporters of Bush.

Our ruling

So: Did the United States produce 14 percent less oil on its public lands last year? Yes.

But there’s nuance in the number. Production under Obama was hobbled due to the Deepwater Horizon disaster, making a one-year figure subject to cherry-picking. And it’s not at all clear that the president in charge when the oil is taken out of the ground deserves full credit or blame; years of prior policies on exploration and drilling had an impact.

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